So, yesterday’s update to the latest kernel (3.11.0-19-generic) broke my Macbook Pro’s WiFi. Here’s how to quickly resolve the issue:

1. Reboot into a previous Kernel, hopefully WiFi will work again.
2. Then run these commands:

3. $ sudo add-apt-repository ppa:mpodroid/mactel
   $ sudo apt-get update
   $ sudo apt-get install b43-fwcutter firmware-b43-installer
   $ wget http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2
   $ tar xf broadcom-wl-5.100.138.tar.bz2
   $ sudo b43-fwcutter -w "/lib/firmware" broadcom-wl-5.100.138/linux/wl_apsta.o

4. Then reboot and you should be able to use the latest kernel with WiFi working once again.